Selective <i>N</i>-formylation/<i>N</i>-methylation of amines and <i>N</i>-formylation of amides and carbamates with carbon dioxide and hydrosilanes: promotion of the basic counter anions of the zinc catalyst
produced N,N-dimethylaniline. Furthermore, our catalytic protocol was developed for the N-formylation of amides and carbamates, which have smaller pKa values and lower reactivities than the corresponding amines. The present Zn(OAc)2/phen catalyst was found to show versatility in the conversion of CO2 and amines into several functionalized organic chemicals under mild conditions. We propose that the basic counter
Mn‐Catalyzed Selective Double and Mono‐<i>N</i>‐Formylation and<i>N</i>‐Methylation of Amines by using CO<sub>2</sub>
作者:Zijun Huang、Xiaolin Jiang、Shaofang Zhou、Peiju Yang、Chen‐Xia Du、Yuehui Li
DOI:10.1002/cssc.201900152
日期:2019.7.5
catalytic formylation and methylation of amines represent convenient and successful protocols for selective CO2 utilization as a C1 building block. This study represents the first example of selective catalytic double N‐formylation of aryl amines by using a dinuclear Mn complex in the presence of phenylsilane. This robust system also allows for selective formylation and methylation of amines under a range
Porous Organic Polymers with Built-in N-Heterocyclic Carbenes: Selective and Efficient Heterogeneous Catalyst for the Reductive N-Formylation of Amines with CO<sub>2</sub>
作者:Hui Lv、Wenlong Wang、Fuwei Li
DOI:10.1002/chem.201803364
日期:2018.11.7
easily prepared. Compared with the analogues homogeneous NHC (SIPr) catalysts, the POPs exhibited an enhanced catalytic activity and high selectivity in the reductive functionalization of CO2 with amines. The extraordinary performance of the sample could be attributed to the combination of the gas enrichment (or storage) effect, enhanced in‐pore concentrations of other substrates, and advantageous
通过八羰基二钴配合物[Co 2(CO)8 ]催化末端炔基的三聚反应,制备了一系列基于N-杂环卡宾(NHC)结构单元的多孔有机聚合物(POP)。通过改变共聚中的单体比例,可以轻松制备出可调节表面积为485-731 m 2 g -1和孔体积为0.31-0.51 cm 3 g -1的交联POPs 。与类似物均相NHC(SIPr)催化剂相比,POPs在CO 2的还原功能化中表现出增强的催化活性和高选择性。与胺。样品的非凡性能归因于气体富集(或储存)效应,其他底物的孔内浓度增加以及多孔聚合物的有利微孔结构的结合。同时,这些催化剂可以容易地从反应体系中分离和再循环,而活性仅损失很小。出色的催化性能和多相催化剂的便捷回收性使其非常具有吸引力。这些含有NHC的POP可能为CO 2的催化转化提供新的平台。
N,N-Diformylanilines were prepared by the reaction of formanilide N-sodium derivatives with acetic-formic anhydride. Treatment of the N,N-diformylanilines with PCl5 and POCl3 solution led to N,N-bis(dichloromethyl)anilines, which were transformed to N,N- bis(difluoromethyl)anilines by reaction with anhydroushydrogenfluoride in pentane solution.